--- 2.4.18pre2aa2/kernel/ptrace.c.~1~	Wed Jan 16 17:52:20 2002
+++ 2.4.18pre2aa2/kernel/ptrace.c	Sun Jan 20 18:53:35 2002
@@ -150,7 +150,7 @@
 
 		ret = get_user_pages(current, mm, addr, 1,
 				write, 1, &page, &vma);
-		if (ret <= 0)
+		if (ret <= 0 || !page)
 			break;
 
 		bytes = len;